你想把杰克介绍给朋友认识,你可以说:A.Hello,Jack. B.Hello!This is Jack.
当你想要询问别人的生日是什么时候时,应该如何问: A. When do you have breakfast? B. When is your birthday?
--- _____ they taking a picture? --- Yes, they are. A. AmB. IsC. Are
Kate ______ playing chess. A. am B. is C. are
______ season do you like best? A. WhichB. WhatC. How
What do you do ______ the weekend? A. onB. inC. at